| GPS接收机中锁频环频率误锁的检测 |
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| 引用本文： | 李国栋,崔晓伟,尹旭明,冯振明. GPS接收机中锁频环频率误锁的检测[J]. 清华大学学报(自然科学版), 2007, 47(1): 69-72 |
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| 作者姓名： | 李国栋 崔晓伟 尹旭明 冯振明 |
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| 作者单位： | 清华大学,电子工程系,北京,100084;清华大学,电子工程系,北京,100084;清华大学,电子工程系,北京,100084;清华大学,电子工程系,北京,100084 |
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| 摘 要： | 为了解决全球定位系统(GPS)接收机中的锁频环在载波同步过程中可能出现的频率误锁问题,在分析了锁频环在噪声环境下的工作原理及产生频率误锁原因的基础上,基于有无发生频率误锁时同一信息符号对应的多个预检测积分值的变化规律,提出了一种用于频率误锁检测和快速纠正的算法。仿真结果表明:该方法能够在锁频环完成工作之后及时判决是否有误锁发生,误锁时可在1~2个导航比特时间内把载波频率调整到正确频率上。该方法实现简单,可有效消除频率误锁给信号同步时间带来的影响。
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| 关 键 词： | 全球定位系统(GPS)接收机 自动锁频环 鉴频器 误锁 预检测积分 |
| 文章编号： | 1000-0054(2007)01-0069-04 |
| 修稿时间： | 2005-11-03 |
Sensing of false locks of the AFC loop in GPS receivers |
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| LI Guodong,CUI Xiaowei,YIN Xuming,FENG Zhenming. Sensing of false locks of the AFC loop in GPS receivers[J]. Journal of Tsinghua University(Science and Technology), 2007, 47(1): 69-72 |
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| Authors: | LI Guodong CUI Xiaowei YIN Xuming FENG Zhenming |
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| Abstract: | False locks can occur in global positioning systems(GPS) when tracking the GPS carrier frequency using an automatic frequency control(AFC) loop.A method is given to detect and correct false locks in noisy environment based on changes in the pre-correlation results.Simulation results show that the method can immediately detect false lock just after the AFC algorithm and modify the tracking frequency to the right point within 12 navigation data bits.Tests also show that the scheme is easily realized and effectively avoids the extra tracking time caused by false locks. |
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| Keywords: | global positioning system(GPS) receiver automatic frequency control(AFC) loop frequency-tracking discriminator false lock pre-correlation |
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